A multi-axis CNC mill then machines each combustion chamber to the same finished shape and volume. Once the head is received at NAPREC, it’s attached to the fixture that positions the head properly for the machining process.
We sent our Project RH9 GT-R’s cylinder head to NAPREC in Japan to undergo the process. In Japan, a number of top machine shops offer CNC machining of combustion chambers. These benefits allow the engine to run more smoothly as each cylinder is likely to produce equivalent power. Machining the chamber also allows deshrouding of the valves which can improve port flow substantially. In addition, it will also tend to equalize the burn rate and, when done properly, should eliminate any potential hot spots in the combustion chamber. When properly processed, the CNC chambers will reduce the variance in compression ratio across cylinders. The shape of the combustion chambers, intake ports and exhaust ports will all influence the performance characteristics of the engine.īy Michael Ferrara // Commentary by Allan Lockheed Jr.Įven if you are planning to use a set of off-the-shelf pistons, which provide performance advantages over stock pistons, you may want to consider having the combustion chambers of your cylinder head CNC machined.
In addition to this responsibility, the cylinder head also plays a role with respect to engine performance. The valve guides, valve seats, valves, valve springs, valve retainers, valve locks, buckets, followers, lash caps and camshafts are all fitted to the cylinder head. Like the cylinder block, the cylinder head is also responsible for holding a number of other components, namely the valvetrain.
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